Cours sur les pteridophytes pdf

College lycee superieur alternance bac examens metiers jobs, stages. Les cellules sexuelles males et femelles sont produites. May 19, 2017 les pteridophytes sont des plantes vasculaires presentant xyleme et phloeme ne produisant ni fleurs ni graines. Like reptiles first true land animals that evolved. Biologie vegetale les pteridophytes botanique youtube. This pdf version does not have an isbn or issn and is not therefore effectively published melbourne code, art. Les pteridophytes sont des plantes vasculaires presentant xyleme et phloeme ne produisant ni fleurs ni graines.

Le sporophyte, perche sur le gametophyte, libere les spores qui sont disseminees par le vent. Les pteridophytes sont des cryptogames vasculaires car ils. Il reconnait les formes flechies feminin, pluriel, conjugaison des verbes. Ferns, horsetails often treated as ferns, and lycophytes clubmosses, spikemosses, and quillworts are all pteridophytes. Introduction au monde vegetal les champignons les algues. Pteridophyta do not produce seeds but they produce spores. Les ecosystemes cotiers setendent des estuaires jusqu a lisobathe 20 m. Useful notes on the classification of pteridophytes. Because pteridophytes produce neither flowers nor seeds, they are sometimes referred to as cryptogams, meaning that their means of reproduction is hidden. Pteridophyta living in water are known as hydrophyte, sticking in other plants are called epiphyte and living in residue or waste of other plants are known as saprophyte. Les pteridophytes sont des plantescryptogames vasculaires sans fleurs comprenant des fougeres, des preles, des lycopodes et des selaginelles. Haeckel 1866 called these groups of plants as pteridophytes because of their pinnate or feather like fronds leaves. The printed version, however, was effectively published on 6 june 20. Jan 23, 2017 introduction and definition the pteridophytes gk.

A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Modified 17 199 embryophytes bryophytes rhynia fossil lycopodiophyta. Les pteridophytes sont des plantescryptogames vasculaires sans fleurs comprenant. Sumita, assistant professor, department of botany, pggc11, chandigarh. In 1880, the cryptogams of the plant kingdom were divided. Modified 17 199 embryophytes bryophytes rhynia fossil lycopodiophyta pteridophyta transition. Les pteridophytes comprennent les fougeres, les preles, les lycopodes et les selaginelles. Pdf cours biologie vegetale abdessamad kellah academia. Pteridophyta is the most highly evolved group among the cryptogams.

A pteridophyte is a vascular plant with xylem and phloem that disperses spores. Read the introductory remarks and list of characteristics of the bryophytes p. Pteridophytes constitute a significant and important group in the plant kingdom. Des lichens incrustants du genre verrucaria forment des taches colorees dans les cours deau rapides. Most pteridophytes are terrestrial and grows in moist and shady places while some flourish well in open dry places.

Les bryophytes vivent le plus souvent en milieu humide. Status of pteridophytes india 500 species of ferns and 100 species of fern allies other than the order of fillicales are on record from india pteridophytic flora of india comprises of 67 families, 191 genera and more than species including 47 endemic indian ferns, and 414 species of pteridophytes 219 at risk, of which 160. The different species of selaginella are grown as the garden plants. As they produce neither flowers nor seeds, they are referred to as cryptogams. Ensuite naitra le sporophyte, lorgane qui portera les spores. Des les premiers stades, le developpement des mega et microsporanges sont identiques. The pteridophytes are an economically important group of plants. Les lichens, bryophytes, pteridophytes et phanerogames aquatiques. Pteridophyte reproduction liverworts hornworts mosses to be cont. Pteridophytes or pteridophyta, in the broad interpretation of the term, are vascular plants plants with xylem and phloem that reproduce and disperse via spores. Morphologiquement, on a une tige, des feuilles et des racines. Pteridophytes introduction, authors and addresses, systematic list, glossary, and key to tribes. Pdf les lichens, bryophytes, pteridophytes et phanerogames. Deux lichens foliaces avec une lame collee au substrat.

Parfois sur les talus des chemins creux et sur les vieux murs ombrages. Les lichens, bryophytes, pteridophytes et phanerogames. Quand des conditions viables reviennent, elles font repartir leur metabolisme. Les epis sporangiferes portent les megasporanges a leur base et les microsporanges a leur apex. Ces elements conducteurs restent malgre tout archaiques.

Le sporophyte est pourvu dun systeme vasculaire les pteridophytes ne. Dec 05, 2016 pteridophytes are vascular plants and have leaves known as fronds, roots and sometimes true stems, and tree ferns have full trunks. Ce site vous offre des cours, des livres, des problemes corriges gratuitement pour toutes les filieres universitaires scientifiques francophone. Firstly all the botanists divided the plant kingdom into two large groups cryptogamia and phanerogamia, linnaeus 1754 used the term cryptogams for the first time for those plants which did not possess visible sex organs. Pteridophyte reproduction christian brothers university. Apospory in pteridophytes pdf the investigations in pteridophytes probably of most interest and importance ing of apogamy and apospory, it is important to define these terms at the. Bulletin mycologique et botanique dauphinesavoie, 2006. Pteridophytes transition to land megaphylls eusporangiate ferns. Ce sont des cryptogames vasculaires a lorigine dune lignee evolutive fig.